Cooling electrical apparatus.



H. HOBART. COOLING ELECTRICAL APPARATUS.

APPLICATION FILED NOV. 11, 1913.

1,105,783. Patefited Aug. 4, 19-14.

Witnesses: inventor" Y fa )5? 724 4, Henry M. Ho hart,

His Attorney.

sirarns ra ra.

HENRY M. HOBART, OF SCHENECTADY, NEW YOBK, ASSIGNOB. TO GENERAL EEECTR-IC COMPANY, A CORPORATION OF NEW YORK.

COOLING- ELECTRICAL APPARATUS.

icense.

To all whom it may concern; r

Be it known that I, HENRY M. HOBART, a citizen of the United States, residing at Schenectady, county of Schenectady, State 'interior of the transformertank and the air enters a tank it tends toconvey with it the moisture which may be in suspension in it. This moisture 111 turn condenses within the tank under certain conditions of temperature relations, with the consequent reduction of the electrical strength of the insulating materials,

In order for moisture to condense out of air it isfnccessary that the air be cooled below the temperature corresponding to its humidity. I propose to utilize this principlc to prevent the condensation of moisture within a tank by cooling the entering air to a temperature lower than that of the transformer tank before the air mixes with the fluid withirr the tank, and receiving and harmlessly disposing of the moisture which.

may condense out. It is preferable that this temperature shall be lower than to which the air may be subjected while within the tank. In water cooled and similar artificially cooled transformers. this cooling of the entering air may be readily accomplished by subjecting it to the effects of the entering cooling fluid. To do this I prefer to surround pipe conveying the air between the interior of the tank and the atmosphere by a fluid conductor, as a jacket, through which the cooling fluid may flhw on its Way to the interior of the tank.

The single figure of the drawing illustrates my invention applied to a common form of water cooled transformer.

The transformer tank 1 contains a trans Specification of Letters Patent. I

Applicatioh filed November 11, 1913.

Patented Aug. at, 1914.

Serial No. 800,306.

former 2 above which is suspended the coolmg coil 3. According to common practice, the cooling coil 3 is located below the surface of the oil insulating and cooling the transformer 2 and is constantly supplied with water through the pipe &, the water flowing out of the coil through the pipe 5. Abo e the surface of the oil is an 'air chamber. This-air chamber communicates-with' fthe atmosphere through the pipe o. About a vertical portion of the pipe 6 I have placed the jacket 7. The upper end of the jacket 7 is connected to the pipe 4 and the lower end is connected to the pipe Sof the source of water for the cooling coil.

It will be apparent from this construction that as water flows from the source 8 to the cooling coil, it passes through the jacket 7 about the pipe 6. Any airldrawn into the transformer tank passes through the pipe 6. The pipe 6 and the jacket 7 are of such length that the. air in its passage through the pipe 6 is cooled, preferably, to a temperature below any to which it will be subjected within the transformer tank and is maintained at this low temperature for a sufficientperiod of time to allow so much moisture to be condensed out as the air can give up at this temperature. The pipe 6 being vertical and open at its lower end, this moisture condensin on the interior of the pipe 6 flows down the pipe 6 and out at its end. The result of this is that after the air passes, through the pipe 6 into the interior of the tank 7 no more moisture will be given up by it so long as it remains within the tank.

It will be understood that this construction is but a siniple preferred one involving my invention, particularly applicable to water cooled transformers, and that my invention is not limited to this construction but is defined by the following claims.

What I claim as new and desire to secure by otters Patent of the United States, is z- 1.'The combination with a transformer tank and a transformer therein, of means to cqil, of a pipe providing a passage- In Witness whereof, I have hereunto set fer the exchange of an between the atmy hand thls 10th day of November 1913. mosphere and the mtenor 0f the tank and a *1 m r L V \LE fiuld conductlng means about sald plpe, sald H NR i I 5 fiuld cqnductmg means bemg connected be- Wltnessest tween the coohng fiuld supplylng means and BENJAMIN. B. HULL,

"the cooling coil. ORFQRD, 

